Visualization of heterogeneity in a matrix by mapping the values in the matrix to RGB values:
We aim to contruct heat-maps of matrices in java, similar to the imagesc function in octave

To get the heat map of a matrix arr first initialize a new Display object with arr
Display dis = new Display(arr);
Then call the show method to create the heat-map
dis.show();
You can also show a color-scale for reference:
dis.colorBar(100) // divided the color-bar into hundred divisions. For a more accurate scale, use a higher value, although 100 is the recommended value